A flow commissioning method and system for a ship cooling water system

Abstract

The application discloses a flow debugging method and system for a ship cooling water system, the flow debugging method comprising the following steps: constructing a pipe network model of the ship cooling water; setting data parameters of each component in the pipe network model and fluid parameters in the pipe network; calculating a first flow value and a turbulence intensity value; obtaining a suitable valve opening degree by judging the turbulence intensity value and the flow value; applying the valve opening degree to an actual ship pipe system; judging whether an actual flow meets a preset flow range; and determining a final execution valve opening degree. Furthermore, the application can realize reasonable distribution of the flow of the cooling water system, realize high-accuracy flow debugging, and avoid causing insufficient or excessive cooling of mechanical equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship pipeline flow regulation, in particular to a flow regulation method and system for a ship cooling water system. BACKGROUND

[0002] The pipeline system is an important part of a ship, and the ship cooling water system provides cooling water for the whole ship to take away the excess harmful heat generated during the operation of the equipment, thereby ensuring the normal operation of the equipment. The mechanical equipment that needs to be cooled in the system includes the main and auxiliary diesel engines, the oil cooler, the fresh water cooler, the bearings of the shafting, the air compressor, the condenser, the air conditioner, etc., among which the main engine has the largest amount of heat to be dissipated. Therefore, the ship cooling water system is often centered on the cooling pipeline of the main engine, and is composed of the cooling pipelines of other mechanical equipment and various cooling auxiliary equipment, and the equipment is numerous and the pipeline network is complex.

[0003] The amount of heat to be dissipated by various equipment in the cooling water system often differs, and therefore the consequences of insufficient cooling or excessive cooling should be fully considered when determining the flow distribution of the cooling water. For example, for the main engine, insufficient cooling will cause the parts to be overheated, resulting in a decrease in the mechanical properties of the material, thermal stress and deformation, excessive wear and even damage due to seizure. On the contrary, excessive cooling will cause the cooling water to take away too much heat, thereby reducing the economy of the main engine. When using oil with a high sulfur content, excessive cooling will cause sulfuric acid to be formed in the cylinder to corrode the cylinder wall and the piston. Therefore, the reasonable distribution of the flow of the cooling water system is very important.

[0004] At present, the published patents on the flow regulation of the pipeline network system mainly focus on the fields of water supply and drainage pipeline network, ventilation pipeline network, heating pipeline network, and liquid cooling pipeline network. For example, the invention patent CN102278598B provides a large pipeline network flow distribution test method, which calibrates the flow resistance characteristic curve of each ventilation branch of the pipeline network, sequentially releases the maximum flow resistance ventilation branch and the nearest branch, and gradually installs a flow limiting ring at each branch ventilation port to control the flow resistance of each branch to be the flow resistance under the design ventilation flow, thereby completing the distribution of the flow of the pipeline network.

[0005] In view of the large number of valves used in the actual cooling water system, efficient regulation of the cooling water can be converted into reasonable setting of the valves. However, the valves of the ship cooling water system usually only have two states of opening and closing, and when the two states of opening and closing cannot meet the flow requirements of the pipeline network system during system operation, a throttle orifice plate is generally used to regulate the pressure and thereby regulate the flow of the corresponding pipeline to avoid excessive flow in the equipment. Therefore, the distribution of the cooling water is further converted into the setting of the geometric size of the throttle orifice plate.

[0006] During the on-site debugging process, due to the complexity of the pipe network, when the valve is fully opened, the orifice plate is fixed in structure after installation, and the orifice diameter can only be adjusted by continuously replacing the orifice plate or modifying the structure of the orifice plate on site to achieve the actual required pipeline flow. The adjustment process needs to be repeated iteratively, which is difficult and time-consuming, and often causes the orifice plate to be scrapped due to improper orifice diameter adjustment, resulting in a huge waste of labor and materials, so a high-precision optimization design and debugging method for the ship cooling system is urgently needed to debug the flow during the pipe network design stage. SUMMARY

[0007] In view of the above-mentioned disadvantages of the prior art, the purpose of the present application is to provide a flow debugging method and system for a ship cooling water system to achieve reasonable distribution of the flow of the cooling water system and high-accuracy flow debugging to avoid insufficient or excessive cooling of mechanical equipment.

[0008] To achieve the above-mentioned purpose and other related purposes, the present application provides a flow debugging method for a ship cooling water system, comprising:

[0009] S1: constructing a pipe network model of the ship cooling water system, the pipe network model comprising a plurality of components, the plurality of components comprising a pipeline and a valve;

[0010] S2: setting data parameters of each component in the pipe network model and fluid parameters in the pipe network, and setting the resistance coefficient of the valve to be the minimum, at which time the resistance coefficient corresponding to the valve is a first valve resistance coefficient;

[0011] S3: calculating a first flow value and a turbulent intensity value in each pipeline according to the set value of the data parameter, the set value of the fluid parameter, the first valve resistance coefficient, and a resistance coefficient-Reynolds number relationship curve when the valve is fully opened;

[0012] S4: comparing the turbulent intensity value with a preset turbulent intensity range to determine whether the turbulent intensity value is within the preset turbulent intensity range;

[0013] S5: comparing the first flow value corresponding to the case where the turbulent intensity value is within the preset turbulent intensity range with a first preset flow range to determine whether the first flow value is within the first preset flow range, and obtaining a second valve resistance coefficient of each valve according to the first flow value within the first preset flow range;

[0014] S6: obtaining a first valve opening degree according to the resistance coefficient-valve opening degree curve and the second valve resistance coefficient;

[0015] S7: applying the first valve opening degree to an actual ship pipeline system to obtain a flow value in the actual ship pipeline system, denoted as a third flow value;

[0016] S8: judging whether the third flow value is in the second preset flow range, and taking the valve opening degree corresponding to the third flow value in the second preset flow range as the final execution valve opening degree.

[0017] Optionally, in the step of judging whether the turbulence intensity value is in the preset turbulence intensity range, the following steps are included:

[0018] When the turbulence intensity value is in the preset turbulence intensity range, the step S5 is executed;

[0019] When the turbulence intensity value is not in the preset turbulence intensity range, the pipe sections in the pipe network model are adjusted, and the step S1 is returned.

[0020] Optionally, in the step of judging whether the first flow value is in the first preset flow range, the following steps are included:

[0021] When the first flow value is in the first preset flow range, the first valve resistance coefficient is the second valve resistance coefficient;

[0022] When the second flow value is not in the first preset flow range, the flow values of the pipelines are set in the first preset flow range, the flow values set in the first preset flow range are defined as the second flow values, and the second valve resistance coefficients of each valve are trial calculated according to the second flow values.

[0023] Optionally, in the step of trial calculating the second valve resistance coefficients of each valve according to the second flow values, the following steps are included:

[0024] If the trial calculation is successful, the resistance coefficients of each valve for which the trial calculation is successful are the second valve resistance coefficients of each valve obtained;

[0025] If the trial calculation fails, the pipeline system of the pipe network model needs to be adjusted, and the steps S1-S5 are repeated until the second valve resistance coefficients of each valve are obtained.

[0026] Optionally, in the step of judging whether the third flow value is in the second preset flow range, the following steps are included:

[0027] If the third flow value is in the second preset flow range, the first valve opening degree is the final execution valve opening degree;

[0028] If the third flow value is not in the second preset flow range, the pipe sections in the pipe network model are adjusted, and the step S1 is returned until the third flow value is in the second preset flow range, and the valve opening degree at this time is taken as the final execution valve opening degree.

[0029] Optionally, after the step of taking the valve opening degree corresponding to the third flow value in the second preset flow range as the final valve opening degree, the following steps are included:

[0030] execute the final valve opening in the actual ship pipeline system, and obtain the actual resistance coefficient, and record it as a third valve resistance coefficient, and obtain the Reynolds number value;

[0031] According to the final valve opening, the third valve resistance coefficient and the Reynolds number value, the resistance coefficient-valve opening-Reynolds number curve is corrected.

[0032] Optionally, in the step of executing the final valve opening in the actual ship pipeline system and obtaining the third valve resistance coefficient, it comprises:

[0033] According to the third valve resistance coefficient and the first valve resistance coefficient, the resistance coefficient of the orifice plate is calculated;

[0034] According to the resistance coefficient of the orifice plate, the aperture parameter of the orifice plate is calculated;

[0035] According to the aperture parameter of the orifice plate in the actual ship pipeline system, the final valve opening is executed.

[0036] Optionally, in the step of obtaining the third valve resistance coefficient, it comprises:

[0037] The third valve resistance coefficient is calculated by the differential pressure reading of the pressure sensor arranged in the actual ship pipeline system.

[0038] Optionally, after the resistance coefficient-valve opening-Reynolds number curve is corrected, it further comprises:

[0039] The fourth valve resistance coefficient corresponding to the valve opening of each valve is calculated by using the corrected resistance coefficient-valve opening-Reynolds number curve;

[0040] According to the fourth valve resistance coefficient and the first valve resistance coefficient, the resistance coefficient of the orifice plate is calculated;

[0041] According to the resistance coefficient of the orifice plate, the aperture parameter of the orifice plate is calculated;

[0042] According to the aperture parameter of the orifice plate, the aperture of the orifice plate in the actual ship pipeline system is inspected and corrected.

[0043] The application also provides a flow debugging system, comprising:

[0044] The pipe network model construction module is used for constructing a pipe network model according to the actual ship pipeline system;

[0045] The data parameter setting module is used for setting the data parameters of various components in the pipe network model and the fluid parameters in the pipe network, and setting the resistance coefficient of the valve as the minimum, so that the resistance coefficient corresponding to the valve is the first valve resistance coefficient;

[0046] a calculation module configured to calculate a first flow value and a turbulence intensity value in each pipe according to the data parameters, the fluid parameters and the first valve resistance coefficient;

[0047] a first comparison and judgment module configured to compare the turbulence intensity value with a preset turbulence intensity range to determine whether the turbulence intensity value is within the preset turbulence intensity range, compare a first flow value corresponding to the case that the turbulence intensity value is within the preset turbulence intensity range with a first preset flow range to determine whether the first flow value is within the first preset flow range, and obtain a second valve resistance coefficient of each valve according to the first flow value within the first preset flow range;

[0048] a valve opening calculation module configured to calculate and obtain a first valve opening according to the resistance coefficient-valve opening curve and the second valve resistance coefficient;

[0049] a second comparison and judgment module configured to obtain a third flow value corresponding to the case that the first valve opening is executed in the actual ship pipeline, determine whether the third flow value is within a second preset flow range, and take a valve opening corresponding to the third flow value within the second preset flow range as a final valve opening.

[0050] Optionally, the first comparison and judgment module further comprises:

[0051] a turbulence intensity comparison and judgment module configured to compare the turbulence intensity value with the preset turbulence intensity range to determine whether the turbulence intensity value is within the preset turbulence intensity range;

[0052] a flow comparison and judgment module configured to compare a first flow value corresponding to the case that the turbulence intensity value is within the preset turbulence intensity range with the first preset flow range to determine whether the first flow value is within the first preset flow range, and obtain a second valve resistance coefficient of each valve according to the first flow value within the first preset flow range;

[0053] a trial calculation module configured to, when the flow comparison and judgment module determines that the first flow value is not within the first preset flow range, set the flow value of each pipe within the first preset flow range, define the flow value set within the first preset flow range as a second flow value, and trial calculate the second valve resistance coefficient of each valve according to the second flow value.

[0054] Optionally, the flow debugging system further comprises:

[0055] a resistance coefficient-valve opening-Reynolds number curve correction module configured to correct the resistance coefficient-valve opening-Reynolds number curve according to a third valve resistance coefficient obtained when the final execution valve opening is executed in the actual ship pipeline system, the final execution valve opening and a Reynolds number value;

[0056] The throttle orifice plate aperture parameter calculation module is configured to calculate a fourth valve resistance coefficient according to the corrected resistance coefficient-valve opening-Reynolds number curve correction module, calculate a resistance coefficient of the throttle orifice plate according to the fourth valve resistance coefficient and the first valve resistance coefficient, and further calculate an aperture parameter of the throttle orifice plate according to the resistance coefficient of the throttle orifice plate.

[0057] Compared with the prior art, the flow debugging method and system for the ship cooling water system has at least the following beneficial effects:

[0058] Compared with engineering practice, there are few patents on flow distribution debugging of ship cooling water systems in the current disclosed patents, and most of the pipe network simulations use a table lookup method to obtain the resistance coefficient when the valve is fully open. For example, the resistance coefficient when the stop valve is fully open is shown in Table 1, and the corresponding relationship between the valve opening, the flow state and the resistance coefficient is unknown. For the fine design and simulation of the ship cooling system, the influence of the valve opening and the flow state on the valve resistance coefficient needs to be considered, and then reliable pipe network simulation results are combined with the throttle orifice plate design to provide guidance for the cooling system design and debugging.

[0059] The present application can be used for flow debugging in the design stage of the ship cooling water system pipe network, ensuring that each pipe meets the flow demand, and solving the valve opening and resistance coefficient, and outputting the throttle orifice plate aperture parameter to provide guidance for the later field debugging, which has great advantages in promoting the debugging process, reducing labor and material costs, etc.

[0060] The flow debugging system of the present application is applied to the above method, and also has the above technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0061] Figure 1 The flow chart of the flow debugging method for the ship cooling water system described in the embodiments of the present application;

[0062] Figure 2 The simulation diagram of the ship cooling water system in the embodiments of the present application;

[0063] Figure 3 The operation step diagram of the flow debugging method for the ship cooling water system described in the embodiments of the present application;

[0064] Figure 4a The curve diagram of the resistance coefficient of the valve varying with the pipe flow state (Reynolds number Re) when the valve is fully open in the embodiments of the present application;

[0065] Figure 4b The curve diagram of the resistance coefficient of the valve varying with the Reynolds number and the valve opening in the embodiments of the present application;

[0066] Figure 5 The structure diagram of the throttle orifice plate in the embodiments of the present application;

[0067] Figure 6 for the embodiment of the present application Figure 3 the optimization operation step diagram after the steps shown in the figure;

[0068] Figure 7 for the embodiment of the present application for the flow commissioning system of the ship cooling water system.

[0069] List of reference signs:

[0070] 1 pipe

[0071] 2 orifice plate

[0072] 3 orifice plate hole DETAILED DESCRIPTION

[0073] The embodiments of the present application are illustrated by specific working examples below, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied by different specific embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0074] It should be understood that the diagrams provided in the embodiments of the present application only illustrate the basic concept of the present application in a schematic manner, and although only the components related to the present application are shown in the diagrams, the actual implementation does not draw the components according to the number, shape and size of the components in the actual implementation, and the shape, number and proportion of each component in the actual implementation can be changed arbitrarily, and the layout form of the components can also be more complex. The structure, proportion, size, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and do not define the limiting conditions for the implementation of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed in the present application.

[0075] The embodiment provides a flow commissioning method for a ship cooling water system, referring to Figure 1 The flow commissioning method comprises the following steps:

[0076] S1: Construct a pipe network model of the ship cooling water system, the pipe network model comprises a plurality of components, and the plurality of components comprise pipes and valves;

[0077] Specifically, the pipe network model of the ship cooling water system is constructed, and the pipe network model constructed in the embodiment is as shown in Figure 2The pipe network model includes various components, and the main components include various pipes, pipe fittings (valves, tees, elbows, reducers, etc.), and various equipment. At the same time, the boundary conditions of the pipe network need to be obtained and set synchronously, and the boundary conditions mainly refer to pressure boundaries or velocity boundaries.

[0078] S2: Set the data parameters of each component in the pipe network model and the fluid parameters in the pipe network, and set the resistance coefficient of the valve to be the minimum, at which time the resistance coefficient corresponding to the valve is the first valve resistance coefficient;

[0079] Specifically, referring to Figure 3 , the parameters of each component in the pipe network model and the fluid parameters are set, mainly including pipe, pipe fitting parameters, equipment inlet and outlet parameters, pump performance curve, and pipe fluid parameters (density, temperature, and pressure).

[0080] Referring to Figure 3 , all valves in the pipe network model are set to be fully open, so that the resistance coefficient corresponding to each valve is the minimum, and the minimum valve resistance coefficient is recorded as the first valve resistance coefficient. The specific value can be obtained by program calling or from Table 1.

[0081] Table 1 Minimum resistance coefficients of stop valves, check valves, and gate valves

[0082]

[0083] The minimum resistance coefficient of the butterfly valve can be calculated. The minimum resistance coefficient of the butterfly valve is calculated according to formula (1):

[0084]

[0085] In formula (1):

[0086] ξ - minimum resistance coefficient of butterfly valve;

[0087] g - gravitational acceleration (9.81 m / s 2 );

[0088] P2 - local resistance loss pressure head (Pa);

[0089] V - flow rate (m / s).

[0090] S3: According to the set values of the data parameters, the fluid parameters, and the first valve resistance coefficient, calculate the first flow value and the turbulence intensity value in each pipe;

[0091] According to S1 and step S2, the data parameters of each component are obtained, including the parameters of the pump (characteristic curve fitting), the pipe diameter, the roughness inside the pipe, the inlet and outlet boundary parameters, etc. The valve is set to the fully open state, the influence of the internal flow state of the valve on the valve resistance is considered, and the curve of the resistance coefficient of the valve when fully open with the Reynolds number Re (representing the flow state inside the pipe) is obtained, as shown in Figure 4a Need to be explained, the curve of the resistance coefficient of the valve when fully open with the Reynolds number Re is obtained according to the experience accumulation. Further, the curve of the resistance coefficient of the valve when fully open with the Reynolds number Re (representing the flow state inside the pipe) is fitted and obtained, and the relationship is introduced into the commercial pipe network software such as Applied Flow Technology, Flomaster, etc. or the self-simulation software is used for iterative solution to obtain the flow rate Q of each pipe, which is recorded as the first flow rate value. And the turbulent intensity value I of the fluid in each pipe of the pipe network is obtained by using the transient flow calculation module in the pipe network software, and then the turbulent intensity value of the whole pipe network is obtained.

[0092] S4: Compare the turbulent intensity value with the preset turbulent intensity range to determine whether the turbulent intensity value is within the preset turbulent intensity range;

[0093] The turbulent intensity value is compared with the preset turbulent intensity range, and in this embodiment, the preset turbulent intensity range is I≤1%. The value of the turbulent intensity range I will have an impact on the vibration inside the pipe network to a certain extent. If the vibration of the pipe network is too large, it will affect the service life of the pipe network system, and then the vibration state in the pipe network is judged to ensure that the vibration of the pipe network is small and increase the service life of the pipe network system. If the turbulent intensity value I of the pipe section is ≤1%, it can be judged that no vibration is generated inside the pipe network; if the turbulent intensity value I of some pipe sections is >1%, the pipe may have vibration, and the corresponding pipe section should be adjusted. Specifically, the pipe system adjustment includes but is not limited to the adjustment of the corresponding pipe diameter, the adjustment of the pipe trend and the replacement of the accessories such as pumps and other equipment, etc., and then steps S1-S4 are repeated.

[0094] S5: Compare the first flow rate value corresponding to the turbulent intensity value within the preset turbulent intensity range with the first preset flow rate range to determine whether the first flow rate value is within the first preset flow rate range, and obtain the second valve resistance coefficient of each valve according to the first flow rate value within the first preset flow rate range;

[0095] The first flow rate value corresponding to the turbulent intensity value within the preset turbulent intensity range is compared with the first preset flow rate range to determine whether the first flow rate value is within the first preset flow rate range. In this embodiment, referring to Figure 3 , the first preset flow rate range is between 2Q req> Q > 1.2Q req wherein Q is the actual flow value, Q req is the flow demand value.

[0096] When determining whether the first flow value is within the first preset flow range, when the first flow value is within the first preset flow range, the first valve resistance coefficient can be used as the second valve resistance coefficient. When the first flow value is not within the first preset flow range, the flow values of the pipelines are set within the first preset flow range, the flow values set within the first preset flow range are defined as second flow values, and the second valve resistance coefficient of each valve is calculated according to the second flow values. If the trial calculation is successful, the resistance coefficient of each valve that is successfully solved is the second valve resistance coefficient of each valve. If the trial calculation fails, the pipeline system of the pipe network model needs to be adjusted, and steps S1-S5 are repeated until the second valve resistance coefficient of each valve is obtained. Specifically, the valve resistance coefficients of the pipelines are set as independent variables, the minimum value is the resistance coefficient when the valve is fully open, and the maximum value is set to 80. The flow of each pipeline (i.e., the target variable) is set to 2Q req > Q > 1.2Q req , and then the resistance coefficient of each valve is solved. If the valve adjustment is successful (i.e., the resistance coefficient of each pipeline is successfully solved), the valve resistance coefficient at this time is recorded as the second valve resistance coefficient. When the valve adjustment fails (i.e., the calculation fails), the pipeline system needs to be adjusted, including but not limited to adjusting the corresponding pipe diameter, adjusting the pipeline trend, and replacing accessories such as pumps and other equipment. Moreover, the existing commercial software can be used for trial calculation. When the flow Q in the pipeline exceeds 2Q req , the opening of one or more valves needs to be reduced, and the Q value is calculated again through trial calculation or iteration. When the calculated Q value reaches 1.2-2 times Q req , it is determined that the calculation is successful. If the flow value cannot reach the first preset flow range no matter how the valve opening is adjusted, the pipe network system needs to be adjusted, and steps S1-S5 are repeated until the flow value Q reaches the first preset flow range, and then the second valve resistance coefficient of each valve is obtained.

[0097] S6: Obtain the first valve opening according to the resistance coefficient-valve opening curve and the second valve resistance coefficient.

[0098] In step S4, the second valve resistance coefficient of each valve is obtained, and the first valve opening is obtained according to the existing resistance coefficient-valve opening curve. If the corresponding valve opening cannot be found through the curve, the corresponding pipeline needs to be adjusted. Specifically, the pipeline system adjustment includes but is not limited to adjusting the corresponding pipe diameter, adjusting the pipeline trend, and replacing accessories such as pumps and other equipment, and then repeating step S1.

[0099] S7: apply the first valve opening to the actual ship pipeline system to obtain a flow value in the actual ship pipeline system, denoted as a third flow value;

[0100] Referring to Figure 3 , according to the first valve opening output execution, the field valve opening is adjusted. When the field valve has an opening indication, the valve opening (0-100% opening) output by the simulation calculation is adjusted. When there is no opening indication, in order to facilitate field operation, debugging guidance for 1 / 4 opening, 1 / 2 opening, 3 / 4 opening and full opening can be performed. In the field debugging process of the present embodiment, the orifice diameter of the throttle orifice plate is used to equivalently simulate the valve opening in the pipeline network model. Further, in the process of executing the first valve opening or other valve openings, the orifice diameter parameter of the throttle orifice plate under the valve opening can be calculated through the corresponding relationship between the valve resistance coefficient corresponding to the valve opening and the throttle orifice plate resistance coefficient, so as to realize the execution of the first valve opening or other valve openings.

[0101] The one-dimensional pipeline local resistance calculation method is shown in formula (2):

[0102] ξ a =ξ+ξ orifice (2)

[0103] In formula (2):

[0104] ξ a —valve resistance coefficient with opening, a is valve opening: 0-100% opening (or: 1 / 4 opening, 1 / 2 opening, 3 / 4 opening and full opening);

[0105] ξ—valve resistance coefficient when fully open;

[0106] ξ orifice —corresponding throttle orifice plate resistance coefficient.

[0107] According to the fourth valve resistance coefficient, the corresponding throttle orifice plate resistance coefficient in the pipeline is obtained, so as to calculate and output the throttle orifice plate orifice diameter parameter. Limited to the length, only the throttle orifice plate with an angle is used as an example here, and its structure is shown in Figure 5 . Referring to Figure 5 , the throttle orifice plate 2 is arranged in the pipeline 1, and the throttle orifice plate hole 3 is arranged on the throttle orifice plate 2, and the relationship between the throttle orifice plate resistance coefficient and the parameter is shown in formula (3):

[0108]

[0109] In formula (3):

[0110] ξ orifice —resistance coefficient;

[0111] A up — the cross-sectional area of the pipe upstream of the orifice plate;

[0112] A dow — the cross-sectional area of the pipe downstream of the orifice plate;

[0113] A oriftce — the orifice area of the orifice plate.

[0114] wherein A up and A down are known parameters.

[0115] It should be noted that the orifice plate also includes various types such as upstream and downstream area changes, smooth transitions, etc., and the corresponding formula can be used for solving.

[0116] Referring to Figure 3 , after the valve opening adjustment is completed, the actual flow value Q r of the corresponding pipe section is read and recorded, and the actual flow value Q r is denoted as a third flow value.

[0117] S8: Determine whether the third flow value is within a second preset flow range, and take the valve opening corresponding to the third flow value within the second preset flow range as the final execution valve opening.

[0118] Referring to Figure 3 , determine whether the third flow value is within a second preset flow range, take the valve opening corresponding to the third flow value within the second preset flow range as a second valve opening, and take the second valve opening as the final execution valve opening. Specifically, the second preset flow range is Q r < 1.1Q req . Wherein Q r is the third flow value, and Q req is the flow demand value. If Q r > 1.1Q req , it indicates that the pipeline is prone to vibration, and measures such as corresponding pipe diameter adjustment, pipeline trend adjustment, and replacement of accessories such as pumps and other equipment and improvement of support strength need to be taken, and then return to execute S1. If Q r < 1.1Q req , take the valve opening corresponding to the flow value at this time as the final execution valve opening. Similarly, the flow range value will have an impact on whether the pipeline inside the pipeline network vibrates. If the pipeline network vibrates too much, it will affect the service life of the pipeline network system, and then the flow range is used to judge the vibration state in the pipeline network in the actual pipeline network system in this embodiment, so as to ensure that the pipeline network vibrates less and increase the service life of the pipeline network system.

[0119] In an optional embodiment of the present embodiment, a step of modifying the resistance coefficient-valve opening-Reynolds number curve is further included after step S8, which comprises: performing the final execution valve opening in the actual ship pipeline system, obtaining the actual resistance coefficient, and recording it as the third valve resistance coefficient, and calculating the Reynolds number value according to the existing formula. According to the final execution valve opening, the third valve resistance coefficient and the Reynolds number value, the existing resistance coefficient-valve opening-Reynolds number curve is modified. The third valve resistance coefficient is calculated by the differential pressure reading ΔP of the pressure sensor arranged in the actual ship pipeline system. The relationship curve between the valve opening, the resistance coefficient and the Reynolds number is further modified and optimized, as shown in Figure 4b It should be noted that, Figure 4a and Figure 4b The flow resistance coefficient in and the resistance coefficient are the same concept, which is described here to avoid misunderstanding. The third valve resistance coefficient can be solved according to the formula , in which ΔP is the pressure sensor reading, ρ is the fluid density, v is the flow rate, and ξ is the resistance coefficient. At the same time, the actual Reynolds number is solved by the existing Reynolds number formula.

[0120] Optionally, after modifying the resistance coefficient-valve opening-Reynolds number curve, a step of modifying the orifice plate parameters in the actual ship pipeline system is further included. This step comprises: calculating the fourth valve resistance coefficient of each valve corresponding to the valve opening by using the modified resistance coefficient-valve opening-Reynolds number curve, calculating the resistance coefficient of the orifice plate according to the fourth valve resistance coefficient and the first valve resistance coefficient, calculating the orifice plate aperture parameter according to the resistance coefficient of the orifice plate, and verifying and modifying the orifice plate aperture in the actual ship pipeline system according to the orifice plate aperture parameter.

[0121] Specifically, referring to Figure 3 , the resistance coefficient corresponding to the valve opening of each valve is solved by using the modified Figure 4b curve, the fourth valve resistance coefficient is obtained, and the orifice plate parameters are calculated and verified by using the fourth valve resistance coefficient. The orifice plate aperture parameter is solved by using the above formula (2) and formula (3). After on-site debugging, the orifice plate aperture parameter is verified and modified.

[0122] The present embodiment also provides a flow debugging system, which is described with reference to Figure 7The flow debugging system comprises a pipe network model construction module, a data parameter setting module, a calculation module, a first comparison and judgment module, a valve opening calculation module, and a second comparison and judgment module. The pipe network model construction module is configured to construct a pipe network model according to an actual ship pipe system. The data parameter setting module is configured to set data parameters of various components in the pipe network model and fluid parameters in the pipe network, and set a resistance coefficient of a valve to be the minimum, at which the resistance coefficient of the valve is a first valve resistance coefficient. The calculation module is configured to calculate a first flow value and a turbulent intensity value in each pipe according to the data parameters, the fluid parameters, and the first valve resistance coefficient. The first comparison and judgment module is configured to compare the turbulent intensity value with a preset turbulent intensity range, to determine whether the turbulent intensity value is within the preset turbulent intensity range; compare the first flow value corresponding to the turbulent intensity value within the preset turbulent intensity range with a first preset flow range, to determine whether the first flow value is within the first preset flow range, and obtain a second valve resistance coefficient of each valve according to the first flow value within the first preset flow range. The valve opening calculation module is configured to obtain a first valve opening according to a resistance coefficient-valve opening curve and the second valve resistance coefficient. The second comparison and judgment module is configured to obtain a third flow value corresponding to the execution of the first valve opening in the actual ship pipe, to determine whether the third flow value is within a second preset flow range, and to take a valve opening corresponding to the third flow value within the second preset flow range as a final valve opening.

[0123] Optionally, the first comparison and judgment module further comprises a turbulent intensity comparison and judgment module, a flow comparison and judgment module, and a trial calculation module. The turbulent intensity comparison and judgment module is configured to compare the turbulent intensity value with the preset turbulent intensity range, to determine whether the turbulent intensity value is within the preset turbulent intensity range. The flow comparison and judgment module compares the first flow value corresponding to the turbulent intensity value within the preset turbulent intensity range with the first preset flow range, to determine whether the first flow value is within the first preset flow range, and obtains the second valve resistance coefficient of each valve according to the first flow value within the first preset flow range. The trial calculation module sets the flow values of the pipes within the first preset flow range when the flow comparison and judgment module determines that the first flow value is not within the first preset flow range, defines the flow values within the first preset flow range as second flow values, and calculates the second valve resistance coefficient of each valve according to the second flow values.

[0124] Optionally, the flow debugging system further comprises a resistance coefficient-valve opening-Reynolds number curve correction module and an orifice hole diameter parameter calculation module. The resistance coefficient-valve opening-Reynolds number curve correction module is configured to correct the resistance coefficient-valve opening-Reynolds number curve according to the third valve resistance coefficient and the final execution valve opening obtained when the final execution valve opening is executed in the actual ship pipeline system. The orifice hole diameter parameter calculation module is configured to calculate the fourth valve resistance coefficient according to the corrected resistance coefficient-valve opening-Reynolds number curve correction module, calculate the resistance coefficient of the orifice according to the fourth valve resistance coefficient and the first valve resistance coefficient, and then calculate the hole diameter parameter of the orifice according to the resistance coefficient of the orifice.

[0125] In summary, the present application has high self-learning characteristics. With the advancement of the step of "flow resistance coefficient / valve opening verification and correction", the solution error of steps S1-S8 will gradually decrease, and the reliability of the simulation solution will gradually improve. After multiple method verification and correction, the optimized implementation scheme after self-learning is shown in Figure 6 The valve resistance coefficient obtained by simulation calculation can be used to calculate and determine the geometric size of the orifice.

[0126] The present application verifies the simulation debugging and the later real ship debugging and operation data, continuously corrects and optimizes the calculation results, improves the accuracy and reliability of the debugging method, and provides data support and design guidance for ship production and operation.

[0127] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A method for adjusting the flow rate of a ship's cooling water system, characterized in that, include: S1: Construct a pipe network model of the ship's cooling water system. The pipe network model includes various components, including pipes and valves. S2: Set the data parameters of each component in the pipeline network model and the fluid parameters in the pipeline network, and set the resistance coefficient of the valve to the minimum. At this time, the resistance coefficient of the valve is the first valve resistance coefficient. S3: Based on the set values ​​of the data parameters, the set values ​​of the fluid parameters, the first valve resistance coefficient, and the relationship curve between the resistance coefficient and the Reynolds number when the valve is fully open, calculate the first flow rate and turbulence intensity value in each section of the pipeline. S4: Compare the turbulence intensity value with a preset turbulence intensity range to determine whether the turbulence intensity value is within the preset turbulence intensity range; S5: Compare the first flow rate value corresponding to the turbulence intensity value within the preset turbulence intensity range with the first preset flow rate range to determine whether the first flow rate value is within the first preset flow rate range, and obtain the second valve resistance coefficient of each valve based on the first flow rate value within the first preset flow rate range; S6: Obtain the first valve opening based on the resistance coefficient-valve opening curve and the second valve resistance coefficient; S7: Apply the first valve opening to the actual ship pipeline system to obtain the flow rate value in the actual ship pipeline system, and record it as the third flow rate value; S8: Determine whether the third flow value is within the second preset flow range, and use the valve opening corresponding to the third flow value within the second preset flow range as the final valve opening.

2. The flow rate debugging method according to claim 1, characterized in that, The step of determining whether the turbulence intensity value is within the preset turbulence intensity range includes: When the turbulence intensity value is within the preset turbulence intensity range, proceed to step S5; When the turbulence intensity value is not within the preset turbulence intensity range, the pipe segment in the pipeline network model is adjusted, and the process returns to step S1.

3. The flow rate debugging method according to claim 1, characterized in that, The step of determining whether the first flow rate value is within the first preset flow rate range includes: When the first flow rate value is within the first preset flow rate range, the first valve resistance coefficient is the second valve resistance coefficient; When the first flow rate value is not within the first preset flow rate range, the flow rate value of each pipeline is set within the first preset flow rate range, and the flow rate value set within the first preset flow rate range is defined as the second flow rate value. The second valve resistance coefficient of each valve is calculated based on the second flow rate value.

4. The flow rate debugging method according to claim 3, characterized in that, The step of calculating the second valve resistance coefficient for each valve based on the second flow rate value includes: If the trial calculation is successful, the resistance coefficient of each valve that is successfully solved is the second valve resistance coefficient obtained for each valve. If the trial calculation fails, the pipeline system of the pipeline network model needs to be adjusted, and steps S1 to S5 are repeated until the second valve resistance coefficient of each valve is obtained.

5. The flow rate debugging method according to claim 1, characterized in that, The step of determining whether the third flow value is within the second preset flow range includes: If the third flow rate value is within the second preset flow rate range, then the first valve opening is the final valve opening. If the third flow rate value is not within the second preset flow rate range, the pipe segment in the pipeline network model is adjusted, and the process returns to step S1 until the third flow rate value is within the second preset flow rate range. The valve opening at this time is recorded as the second valve opening, and the second valve opening is used as the final valve opening.

6. The flow rate debugging method according to claim 1, characterized in that, After the step of using the valve opening corresponding to the third flow value within the second preset flow range as the final valve opening, the method further includes: In the actual ship piping system, the final valve opening is executed, and the actual resistance coefficient is obtained and recorded as the third valve resistance coefficient. The Reynolds value is also obtained. The resistance coefficient-valve opening-Reynolds value curve is corrected based on the final valve opening, the third valve resistance coefficient, and the Reynolds value.

7. The flow rate debugging method according to claim 6, characterized in that, The steps of executing the final valve opening in an actual ship piping system and obtaining the third valve resistance coefficient include: The resistance coefficient of the throttling orifice plate is calculated based on the resistance coefficient of the third valve and the resistance coefficient of the first valve. Calculate the orifice diameter parameters of the orifice plate based on its resistance coefficient; The final valve opening is determined by adjusting the orifice diameter parameters of the throttling orifice plate in the actual ship's piping system.

8. The flow rate debugging method according to claim 6, characterized in that, The steps for obtaining the resistance coefficient of the third valve include: The resistance coefficient of the third valve is calculated by using the differential pressure readings of pressure sensors installed in the actual ship's piping system.

9. The flow rate debugging method according to claim 6, characterized in that, After correcting the resistance coefficient-valve opening-Reynolds number curve, the following is also included: The fourth valve resistance coefficient for each valve at the corresponding valve opening degree is calculated using the modified resistance coefficient-valve opening degree-Reynolds number curve. The resistance coefficient of the throttling orifice plate is calculated based on the resistance coefficient of the fourth valve and the resistance coefficient of the first valve. Calculate the orifice diameter parameters of the orifice plate based on its resistance coefficient; The orifice diameter of the orifice plate in the actual ship piping system is inspected and corrected based on the orifice diameter parameters of the orifice plate.

10. A flow rate adjustment system, characterized in that, include: The pipeline model building module is used to build a pipeline model based on the actual ship pipeline system. The data parameter setting module is used to set the data parameters of various components in the pipeline network model and the fluid parameters in the pipeline network, and to set the resistance coefficient of the valve to the minimum. At this time, the resistance coefficient of the valve is the first valve resistance coefficient. The calculation module is used to calculate the first flow rate value and turbulence intensity value in each section of the pipeline based on the data parameters, the fluid parameters and the first valve resistance coefficient; The first comparison and judgment module is used to compare the turbulence intensity value with a preset turbulence intensity range to determine whether the turbulence intensity value is within the preset turbulence intensity range; and to compare the first flow rate value corresponding to the turbulence intensity value being within the preset turbulence intensity range with the first preset flow rate range to determine whether the first flow rate value is within the first preset flow rate range, and to obtain the second valve resistance coefficient of each valve based on the first flow rate value being within the first preset flow rate range; The valve opening calculation module is used to calculate and obtain the first valve opening based on the resistance coefficient-valve opening curve and the second valve resistance coefficient. The second comparison and judgment module is used to obtain the third flow value corresponding to the first valve opening in the actual ship pipeline, determine whether the third flow value is within the second preset flow range, and use the valve opening corresponding to the third flow value within the second preset flow range as the final valve opening.

11. The flow rate debugging system according to claim 10, characterized in that, The first comparison and judgment module also includes: The turbulence intensity comparison and judgment module is used to compare the turbulence intensity value with a preset turbulence intensity range to determine whether the turbulence intensity value is within the preset turbulence intensity range. The flow comparison and judgment module compares the first flow value corresponding to the turbulence intensity value within the preset turbulence intensity range with the first preset flow range to determine whether the first flow value is within the first preset flow range, and obtains the second valve resistance coefficient of each valve based on the first flow value within the first preset flow range. In the trial calculation module, when the flow comparison and judgment module determines that the first flow value is not within the first preset flow range, the trial calculation module sets the flow value of each pipeline within the first preset flow range, defines the flow value set within the first preset flow range as the second flow value, and calculates the second valve resistance coefficient of each valve based on the second flow value.

12. The flow rate debugging system according to claim 10, characterized in that, The flow debugging system also includes: The drag coefficient-valve opening-Reynolds number curve correction module is used to correct the drag coefficient-valve opening-Reynolds number curve based on the third valve drag coefficient, the final valve opening and Reynolds number obtained when the final valve opening is executed in the actual ship piping system. The orifice plate diameter parameter calculation module is used to calculate the resistance coefficient of the fourth valve based on the corrected resistance coefficient-valve opening-Reynolds number curve correction module, calculate the resistance coefficient of the orifice plate based on the resistance coefficient of the fourth valve and the resistance coefficient of the first valve, and then calculate the orifice plate diameter parameter based on the resistance coefficient of the orifice plate.

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